Westinghouse WGen12000DF, Service Manual

Westinghouse Outdoor Power Equipment, LLC | 25

MAINTENANCE

NOTICE

Do not pollute. Follow the guidelines of the EPA or other 

governmental agencies for proper disposal of hazardous 

materials. Consult local authorities or reclamation facility.

SPARK PLUG MAINTENANCE

NOTICE

Always use the Westinghouse OEM or compatible non-

resistor-type spark plug. Use of resistor-type spark plug 

can  result  in  rough  idling,  misfire,  or  may  prevent  the 

engine from starting. 

Inspect and clean the spark plugs after every 100 hours of 

use or six months. Replace the spark plugs after 300 hours 

of use or every year.

1. 

Place the generator on a level surface and allow the 

engine to cool.

2. 

Remove the spark plug boots by firmly pulling the boot 

directly away from the engine.

3. 

Clean the area around the spark plugs. 

4. 

Remove the spark plugs with the included spark plug 

socket wrench.  

NOTICE

Never apply any side load or move the spark plug 

laterally when removing the spark plug. 

5. 

Inspect the spark plugs. Replace if electrodes are 

pitted, burned, or the insulator is cracked. Only use a 

recommended replacement plug. 

6. 

Measure the spark plug electrode gap with a wire-type 

feeler gauge. If necessary, correct the gap by carefully 

bending the side electrode. 

Spark plug gap:

 0.024 – 0.032 in. (0.60 – 0.80 mm)

7. 

Carefully install each spark plug finger tight, then tighten 

as additional 3/8 to 1/2 turn with the spark plug wrench.

8. 

Attach the spark plug boots.  

SPARK ARRESTOR SERVICE

Allow the muffler to cool completely before servicing the 

spark arrestor. Check and clean the spark arrestor after 

every 100 hours of use or six months. Failure to clean the 

spark arrestor will  result in degraded engine performance. 

1. 

Place the generator on a level surface. 

2. 

Carefully remove the carbon deposits from the spark 

arrestor screen with a wire brush. The spark arrestor 

must be free of breaks and tears. Use compressed air 

to clear removed deposits. 

FUEL FILTER

Replace the fuel filter after 100 hours of use. 

Note: 

Have an appropriate gasoline container and rags 

ready to catch residual fuel in the filter and fuel line. 

1. 

Allow the generator to cool completely. 

2. 

Turn the fuel valve to the OFF position.  

3. 

Note the orientation of the fuel filter. Using pliers, remove 

the fuel line clamps and remove the fuel filter. 

4. 

Install the new fuel filter in the reverse order of removal.